Increase default span_stack_trace_min_duration

[AlexanderWert]

Stack trace capturing is relatively expensive in terms of performance. Currently, the recommended default threshold for span_stack_trace_min_duration is 5ms. This value should be changed to improve the cost/benefit ratio of this feature.

Reasoning:

• Errors are unaffected in this proposal
• Performance impact too high as-is
• Bad cost/benefit ratio
• Most other tracers never capture stack traces

Status

Summary:
SPEC issue:

Agent	Increase default span_stack_trace_min_duration
Java
.NET
Go
Node JS
Python
Ruby
PHP

[felixbarny]

As explained in https://github.com/elastic/apm/pull/585#issuecomment-1021371791, we'll only change the default for Node.js for now.